Then HTTP.sys forwards all HTTP requests with host header of “lextudio.com” to
the second site, while all other HTTP requests still go to the first site.

It requires experience to fully understand the concepts of site bindings and
how the HTTP request forwarding works especially when there are multiple sites
on the same machine. Without learning HTTP protocol itself and how
web browser/IIS work together, mistakes can be made easily.

That’s why Jexus Manager includes a specific diagnostics tool in this area.